Stereopticon slide



Feb.; 1937. P. s FECHER l 2,069,304

STEREOPTICON' SLIDE Filed Aug. l0, 1936 .[22 yerear exa/fag Patented Feb. 2, 1937 UNITED STATES PATENT OFFICE Claims.

The invention relates to projector slides and particularly concerns a slide where a hand or spinner is caused to rotate and the movement of such spinner may be observed upon a screen.

It is an object of the invention to provide a slide of the type set forth which is of simple and inexpensive construction and yet eflicient in operation.

A further object aims at providing a slide wherein a rotor bears graduations and cooperates with a stationary index.

A still further object aims at providing a slide wherein the rotor has a series of graduations and is mounted for rotation between two transparent plates, one of which is provided with an index.

Other equally important objects will become apparent from a perusal of the invention, which comprises the means described in the following specification, particularly set forth in the claimsforming a part thereof and illustrated in the accompanying drawing, in which g Fig. 1 is an elevational view of my improved device and associated parts.

Fig. 2 is an' enlarged front view of the slide proper.

Fig. 3 is an enlarged section on the line 3-3 of Figure 2.

Fig. 4 is a front view of the armature employed for actuating the spinner.

Referring to the several views in the drawing, the slide, generally designated by I0, comprises a rectangular plate II which is provided with a flange lI2 upstanding therefrom along the perimeter of the plate to form a casing. A plate I3 is provided with a flange I4 along its perimeter and fits within the flange I2 to form a closure for the casing. A plurality of screws I5 secure the flanges I2 and' Il together in assembled relation.

'I'he plates I I and I3 are provided with a large circular opening I6 and I1 respectively, which openings are of equal diameter and in horizontal alignment. Y

A ring I8 is interposed between the plates II, I3 and is of somewhat larger diameter 'than the openings I6, ,I1 and concentric thereto. Transparent disks I9 and 20, which maybe of glass or other transparent material, are placed on the-inside of plates II and I3 respectivelyand cover the openings I6, I1.

50 'A spacer ring 2I holds the disks I9, 20 in contact with their respective wall.

Poles 22, provided with field coils 23, are secured to corner brackets of the casing and ex- 55 tend radially toward the center of the ring I8 but stop short thereof. lated by a disk 25.

The disks I9, are provided with central apertures to receive a pivot pin 26, on which is mounted a transparent disk 21 surrounded by a 5 metal ring constituting a rotor.

The disk 28 contains a circle of graduations or marks 29 which rotate upon revolution of theI disk 21 and cooperate with a stationary arrow 3l on the disk I9 so that when the disk 21 comes to a 10 stop, one of the graduations of 29 is juxtaposed to the arrow.

The field coils 23 are interconnected, as will be readily seen by reference to Fig. 4, and are connected in series through an inductance 'coil 3|. 15 In the circuit is also provided a resistance 32 and a switch 33 whereby the circuit is closed and opened at will. A plug 34 connected to the circuit is inserted in a socket constituting the source of electrical energy. 20

The induction coil 3I, resistance 32, and the switch 33 are mounted in a box 35 for convenience in handling.

In use, the plug 34 is inserted ina socket (not shown) whereupon a rotating field of magnetism The eld coils are insuis set up in the field coils, provided the switch 33 has been closed, and the ring 28 and disk 21 are rotated. A

Upon opening of the switch 33 the magnetic eld ceases to exist, and the disk 21 will come to 30 a stop with one of the graduations 29 being opposite the stationary arrow 30.

The device is mounted to an insulating disk 36 by a. pair of bolts 31.

The device may be used as a chance device or gaming apparatus, and when inserted in a projector the light rays play upon the screen. In view of the fact that the graduations rotate, and the arrow is stationaryfgreat visibility and accuracy in reading are ensured.

While the drawing shows a preferred embodiment of the invention, numerous changes and alterations may be made. I, therefore, do not limit myself to' the details of construction and 45 arrangement as shown, but wish to claim my invention as broadly as the state of the art permits.

1. A stereopticon slide comprising a transparent 5o plate having an index, a rotor rotatably secured thereto provided with graduations, and an in-l duction motor having a plurality of eld coils secured to said plate and causing said rotor to revolve, said rotor comprisinga transparent disc 55 surrounded by a conducting ring cooperating with said eld coils.

2. A stereopticon slide, comprising a pair of spaced transparent plates, one of said plates having an index, a rotor bearing graduations mounted for rotation between said plates, and electrical means having ileld coils arranged between said plates to cause rotation of said rotor, said rotor comprising a transparent disc surrounded by a conducting ring cooperating with said field coils.

3. A stereopticon slide comprising a pair of spaced parallel transparent plates, one of said plates having an index, a rotor provided with graduations and mounted for rotation between said plates, and electrical means having eld coils provided in the interspace between said plates for causing said rotor to rotate, said rotor comprising a transparent disc surrounded by a conducting ring acooperating with said ield coils. 4. A stereopticony slide comprising a trans-` parent plate having an index, a rotor including a transparent disk provided with graduations and rotatably secured to said plate, and an induction motor having a plurality of eld coils secured to said plate'and causing said rotor to revolve, said rotor comprising a transparent disc surrounded by a conducting ring cooperating with sad field coils.

5. A stereopticon slide comprising a transparent plate having an index, a transparent disk provided with graduations to cooperate with said index, a conducting ring encompassing said disk, and an induction motor having a plurality of field coils secured to said plate and causing said rotor to revolve.

PHILIP S. FISCHER.` 

